loesser



(No Model.) 2 Sheets-Sheet 1.

' R. 83 E. LOESSER.

DIAMOND POLISHING TOOL.

Patented Apr. 21

I Hum/r07? ANDREW EGRAHAM. FHOTO-UTHQWASHIOGTDND C.

2 Sheets-Sheet 2:.

lNqModel.)

- R. & BLOESSER.

DIAMOND POLISHING TOOL. No. 558,734. Patented Apr. 21, 1896.

ANDREW B GRAHAMjHOYo-UTHD WASHINGIDNDQ RICHARD LOESSER AND ERNEST LOESSER, OF BROOKLYN, NE\V YORK FFlCEt ASSIGNORS TO LEON DREYFUS, OF NEW YORK, N. Y.

DIAMOND-POLISHING TOOL.

SPECIFICATION forming part of Letters Patent No. 558,734, dated April 21, 1896.

Application filed July 1, 1895. erial No. 554,537. (No model.)

To all whom it may concern.-

Be it known that we, RICHARD LOEssER and ERNEST LOESSER, citizens of the United States, residing in Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Diamond-Polishing Tools, of which the following is a specification.

This invention relates to an improved tool for polishing the facets or other surfaces of diamonds, and is an improvement on the patent of Leon Dreyfus, No. 534,821, dated February 26, 1895.

The object of our improved tool is to provide means whereby the dop may be quickly adjusted to the proper inclination of the facets, according to the grain of the diamond and according to the number of facets or other surfaces which are to be polished.

Our invention comprises a bed-piece or base, a spring-bar fulcrumed near one end to the bed-piece and formed at its shorter portion with a head-plate having a circular opening formed with a guide-groove, a rotary table mounted to turn in the opening of the head-plate and provided with an annular flange received by the groove in the latter, said head-plate being split through so as to form a tongue, which may be tightened up by means of'a set-screw, so as to bind the rotary table within the head-plate, an oscillating sleeve provided with opposite pivots or journals which bear in suitable lugs extending downwardly from the rotary table, said oscillating sleeve being further provided with a tubular extensionwhich passes through a slot formed in the rotary table, a split tube adapted to slide in the sleeve and its tubular extension, at dop-spindle on which the dop is fixed for holding the diamond, said dop-spindle extending through the split tube, means for compressing and binding the lower split end of the latter onto the spindle, a split nut, the opening of which receives the upper end of the split tube, a binding-screw for securing the split nut to the split tube, a fastening device, which extends from the split nut and passes through an arc-shaped slot formed in a guide-frame,which projects upwardly from the rotary table, and means for axially adjusting the dop-spindle with its dop, all as will be hereinafter described, and then particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a plan view of our improved diamon d-polishing tool. Fig. 2 is a side elevation thereof, showing the same supported on the work-table, the polishing-wheel in dotted lines, and a second position of the dop-spindle, also in dotted lines. Fig. 3 is an enlarged longitudinal vertical section on line 3 3, Fig. 1, lookin g in the direction of the arrow, and the dopspindle being shown in vertical position. Fig.

4 is an underside view of the outer portion or head-plate of the tool, showing the parts carried thereby. Fig. 5 is a detail side elevation of the setting wheel or cylinder for determining the number of facets to be produced or polished oif, and of the parts which are adapted to be axially rotated in the setting-wheel, the same view also showing an attachment which is adapted to extend under and steady the diamond and its mounting; and Fig. 6 is an enlarged transverse section on line 6 6, Fig. 5.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, A indicates the bed-piece or base of the tool, which at one end is provided with a foot a, the underside of which is rounded oif, as shown. In the upper surface of the bed-piece is formed a longitudinal groove a, which receives the outer end of a flat metallic spring-bar B, which, near its outer end, is fulcrumed at b to the outer end of the bed-piece, said spring-bar being formed at its outwardly-projecting end with a horizontal head-plate O. Adjusting devices are provided at the inner or tongue end of the spring-bar for a purpose to be hereinafter stated, and the same consist of a screw-post d, projecting upwardly from the bed-piece through a smooth walled opening in the spring-bar B and receiving a nut D, which forms an abutment or bearing for the springbar when the plane of the head-plate O is adjusted by means of the adjusting-screw D, the stem of which passes through a screwthreaded opening in the spring-bar and into a screw-socket in the bed-piece. At one side of the head-plate O the same is offset and split through at C, so as to form a tongue G which in connection with the portion of the headplate opposite the same is provided with a screw-threaded bore to receive a clampingscrew E. The head-plate O is provided with a circular opening and is formed with an annular groove C in its wall for receiving an annular flange f on a circular rotary table F, which turns in the opening in the head-plate. An oscillating sleeve G, provided with opposite inclines g g is journaled by means of its opposite pivots or journals g in bearing-lugs f, projecting downwardly from the rotary table F, said oscillating sleeve being provided with an upwardly-extending tube G, which passes through a slot F, formed in the rotary table F and extending transversely to the axial line of the pivots. luided and arranged in the sleeve G and the tubular extension thereof is a tube h, which, as shown clearly in Fig. 5, is longitudinally slitted in its lower part at h and at each side of its slit is formed with ears 7L 7L2, which are provided with screwthreaded openings that receive a bindingscrew H for the purpose of binding the split part of the tube 7L onto the dop-spindle II, that passes through the tube, a spline 7t on the spindle, which is received in the slit h, positively preventing axial rotation of the spindle in the tube. A split nut I is provided with an opening which receives the upper end of the tube It and which is clamped onto the tube by means of a binding-screw I, said split nut being provided with a laterally-projecting screw-pin J, which receives a clamping-nut J. In connection with the split nut I and the clamping-nut J the tube 7t and spindle H of the dop are secured and guided in the sleeve G and its tubular extension by means of an upwardly-extending guide-plate K on the rotary table F, said guide-plate being arranged parallel with and alongside of the slot F in the table, and being also provided with an arc-shaped or curved guide-slot K, through which the screw-pin J on the split nut 1 passes.

The dop L is secured to the lower end of the dop-spindle H in any suitable manner for the purpose of holding the diamond L in proper position. The lower end of the dopspindle H is for that purpose preferably screwthreaded to receive a screw-threaded dop or chuck Z, which receives at its lower end opposing fastening or centering screws Z, which fasten the mounting Z of the diamond L in the socket of the dop or chuck.

Having thus described the construction of our improved diamond-polishing tool, we will now describe the method of operating the same.

A diamond having been secured in its dop, which in turn is secured to the lower end of the dop-spindle H, the polishing off of the table, facets, and other parts of the same which have to be polished off can now be accomplished. If a facet is to be polished off, (which, howev er, requires the inclined position of the spindle, as shown in full lines in Fig. 2,) the clamping-nut J and the bindingscrew 1 are loosened, the loosening of the latter permitting the rotation or turning of the tube h and screw-spindle H within the tubular extension G of the sleeve G, so that the proper disposition of the transverse plane of the facet or other part of the diamond to be polished in relation to the polishing-disk M may be secured. This axial adjustment is accomplished by means of a setting-wheel N, which is adapted to turn within an enlarged opening in the oscillating sleeve G. The setting-wheel is made fast to the sleeve G in a manner to be hereinafter stated, and when so made fast it permits the tube h to slide in it, an inwardly-projecting pin N on the setting-wheel extending into the slit of the tube, so as to prevent relative axial movement the one to the other. The setting-wheel N is provided, preferably, with three series of holes or socketsnamely, n W12 The lower circular series of holes a preferably have arranged opposite to them a series of graduated numbers (not shown) which correspond to the number of facets, and which holes 07. and their opposite numbers are adapted to register with an observation-hole g formed in the sleeve G. The upper circular series of holes or sprockets n correspond in number and arrangement to the lower series of holes at and are adapted to receive the inner end of a setscrew P, which passes through the sleeve G, so that the setting-wheel, together with the diamond, may be secured in proper position corresponding to the transverse plane of the same in relation to the plane of the polishingdisk. For properly setting or adjusting intermediate parts of the diamond to be polished stars the intermediate series of holes 07. is provided in the setting-wheel N, said holes being adapted to receive a set-screw P, which also passes through the oscillating sleeve G. After the dop-spindle and tube have been turned in the sleeve and its tube extension and set in the manner described, the angle of inclination of the dop-spindle is fixed. This is done by rocking the oscillating sleeve G on its pivots and setting the clamping-nut J against the guide-frame K, so that the pin J will be opposite the graduation 45, for instance, or other graduation on the guideplate K, which corresponds to the facets or other portion of the diamond to be polished off, the dop-spindle, in the present instance, being shown in the proper angle of forty-five degrees for polishing off a facet.

In adj usting the inclination of the dop-spindle, as stated, a compound movement is produced-namely, the rocking movement of the sleeve G on its pivots and the sliding of the tube 71. and dop-spindle in said sleeve and its tubular extension. This movement always causes the dop and diamond to be moved in a parallel plane to the polishing-wheel M.

The grain of diamonds varies in many instances, and as it is absolutely necessary for the purpose of properly polishing them that they be out against their grain, the support- IIS ing rotary table F is provided, which, on being rotated, changes the position of the grain, with relation to the polishing-disk M, by moving the diamond to another point above the latter, after which the clamping-screw E is tightened, so as to bind the table within the head-plate C. If desired, a series of graduations may be provided on the under side of the head-plate G for determining the distance of rotation of the rotarytable F, said table bein g provided with a suitable indicating-mark.

As a facet or other part of the diamond is ground down, the plane of the head-plate C with relation to that of the polishing-disk M changes, and this is compensated for by means of the adjusting-screw D, which is turned so as to act on the spring-bar B and thereby to cause the parallelism of the head-plate C and the rotary table F with the grinding-disk M. A11 adjustable limit pin or stop Q is provided with a screw-threaded portion, which isreceived in a screw-threaded opening in the bedpiece A, said limit-pin being further provided with a milled head q for the purpose of adjusting the same. This limit pin or stop Q, by abutting at its lower end upon the upper surface of the supporting table T 011 which the tool is arranged, limits and determines the degree to which the facet, table, cullet, or other part of the diamond is to be polished, as, after the limit-pin abuts or rests upon the table T, the diamond is not pressed by means of the weight of the tool or the weight placed on the same against the polish in g-surface of the polishing-disk M, andhence all further polishing thereof ceases. The form of the limit pin or stop is that of amicrometerscrew, but it is evident that any suitable form of stop may be substituted.

It maybe found necessary to steady the diamond and its mounting in the chuck or dop L, and this may be effected from the side not being acted on by the polishing-disk by means of a steadying-finger R, which at its lower end engages the diamond and at its upper end is secured by means of nuts 4 r to a collar S, which is in turn secured to the upper part of the dop by means of a set-screw S, that takes into a groove 1 in the dop, said groove permitting the adjustment of the finger by turning the collar and resetting'screw S to any point around the diamond.

in a horizontal plane, substantially as set forth. I

2. In a diamond-polishing tool, the combi nation of a bed piece or base, a head-plate supported thereby and provided with a circular opening, a rotary table mountedto turn in said opening, and provided with a slot, an axially-rotatable dop-spindle pivotally supported in said slot, devices for adjusting the angle of the dop-spindle, means for axially adjusting the dop-spindle, and means for binding or fixing the table in the head-plate, substantially as set forth.

3. In a diamond-polishing tool, the combination of a bed-piece, a head-plate supported thereby, a sleeve pivoted below the head-plate and provided with a tubular extension, a dopspindle provided with a dop and arranged within the sleeve and the tubular extension, a guide-frame projecting above the head-plate and means for adjusting the spindle on the guide-frame, so as to determine the angle of inclination on the same, substantially as set forth.

4. In a diamond-polishing tool, the combination of a bed-piece, ahead-plate supported thereby, a sleeve pivoted to the head-plate, a tube arranged and guided in the sleeve, a dop-spindle located in and adapted to be fixed t0 the tube, a guide-frame projecting above the head-plate, and means for adjusting the spindle and tube on the guide-frame, substantially as set forth.

5. In a diamond-polishing tool, the combination of abed piece, a head-plate on the bedpiece provided with a circular opening, a rotary table mounted to turn in said opening, means for binding the table within the headplate, an oscillating sleeve pivoted to the under side of the table and provided with a tubular extension passing through the slot in the table, a dop-spindle provided with a dop and arranged in the sleeve and the tubular extension and an upwardly-projectingguideframe on the table provided with means for adj usting the angle of inclination of the spindle, substantially as set forth.

6. In a diamond-polishing tool, the combination of a bed-piece, a spring-bar fulcrumed on the bed-piece and provided at one end with a head-plate and at the other end. with adj usting devices for adjusting the plane of the head-plate, a dop-spindle provided with a dop, means for supporting the dop-spindle on the head-plate, and means for adjusting the position of the spindle, substantially as set forth.

7. In a diamond-polishing tool, the combination of a bed-piece, a spring-bar fulcrumed to the bed-piece and provided with a headplate having a circular opening, adjusting devices passing through the spring-bar and into the bed-piece for adjusting the plane of the head-plate, a rotary table mounted to turn in the opening in the head-plate, means for binding or clamping the table in the headsupporting and adjusting the spindle in the head-plat'e,'-and a'limit'pin or stop, substantially asset forth.

In testimony that We claim the foregoing as our invention WGhLVG signed our names in presence of two subscribing Witnesses.

' RICHARD LOESSER. ERNEST LOESSER.

Witnesses:

Gno. L. W HEELOCK, GEORGE W. JAEKEL. 

